BWO radiation spectral characteristics:
Blue solid line is phase locked-in BWO radiation spectrum at about 310 GHz
Red dashed line corresponds to free-running BWO output spectrum (the spectrum
bandwidth is determined by stability of the BWO power supply).
Phase locked-in BWO radiation spectrum close to the carrier frequency.
The 10-Hz spectrum band width at FWHM is determined by the resolution of the used
Phase locked BWO radiation phase noise plot (Agilet 8254A microwave synthesizer
was used as reference)
Black: BWO operating at 310 GHz. Blue: phase noise of Agilent 8254A
harmonic at 103 GHz. Red: phase noise of Agilent 8254 synthesizer
operating at 18 GHz
The plot clearly demonstrates an increase of phase noise by a factor of 20log(n) with
frequency up-conversion by PLL. n - reference frequency multiplication
Contribution of the PLL to the BWO radiation phase noise can be estimated